1、Designation: D4653 87 (Reapproved 2015)Standard Test Method forTotal Chlorides in Leather1This standard is issued under the fixed designation D4653; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numbe
2、r in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This test method is intended for use in determining to
3、talchlorides in mineral tanned leather.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the
4、user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2813 Practice for Sampling Leather for Physical andChemical Tests3. Significance and Use3.1 This test method
5、 is used to determine amount of solublechlorides in leather.4. Apparatus4.1 Volumetric Flask, 250 mL.5. Reagents5.1 Acetic Acid Solutions5 or 10 % by volume.5.2 Methyl Orange0.02 % solution in 50 % alcohol.5.3 Ammonium Hydroxide Solution, (0.1 N).5.4 Silver Nitrate, Standard Solution, (0.1 N).5.5 Po
6、tassium Chromate Solution, 5%.6. Sampling, Test Specimens and Test Units6.1 The test specimen shall consist of1gofleather from thecomposite sample in accordance with Practice D2813.6.2 Two specimens from the composite sample shall betested.7. Procedure7.1 Weigh the specimen to the nearest milligram
7、and recordthe value as W. Transfer the specimen to a 250 mL volumetricflask and add 200 mL of 0.1 N ammonium hydroxide solution.Immerse the flask up to the neck in a bath of boiling water.Thoroughly wet all particles by occasional swirling. After 2 h,cool the flask to room temperature and make the f
8、lask up tovolume with distilled water, shake and without delay filterthrough a folded filter paper.7.2 Discard the first 20 to 25 mL of the filtrate. Pipette 200mL of the filtrate into a 600 mL beaker, add a few drops ofmethyl orange indicator and neutralize with 5 % acetic acid toan orange color.Ad
9、d 2 to 3 mL of 5 % potassium chromate andtitrate the solution with 0.1 N silver nitrate. Record themillilitre of silver nitrate asA. Titrate 200 mL of distilled watercontaining a few drops of methyl orange indicator and 2 to 3mL of 5 % potassium chromate with 0.1 N silver nitrate as ablank and the m
10、illilitre of silver nitrate used and recorded as B.8. Calculation of Results8.1 Calculate the percent total chlorides as follows:total chlorides,%5 A 2 B!N/W 30.0355 3250/200 3100 (1)where:A = millilitres of standard silver nitrate used for titrating thesample,B = millilitres of standard silver nitr
11、ate used for titrating theblank,N = normality of the standard silver nitrate, andW = weight of the specimen.8.2 The total chlorides in the sample for test shall be theaverage of the test result obtained from the specimens tested.9. Report9.1 Unless otherwise specified in the detail specification, th
12、eresult shall be reported to the nearest 0.1 %.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on Chemical Analysis.Current edition approved Sept. 1, 2015. Published October 2015. Originallyapproved in 1987. Last pre
13、vious edition approved in 2009 as D4653 87 (2009).DOI: 10.1520/D4653-87R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe
14、 ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States110. Precision and Bias10.1 This test method is adopted from the procedures of theAmerican Leather ChemistsAssociation where it has long beenin use and where it was approved
15、 for publication before theinclusion of precision and bias statements were mandated. Theoriginal inter-laboratory test data is no longer available. Theuser is cautioned to verify by the use of reference materials, ifavailable, that the precision and bias of this test method isadequate for the contem
16、plated use.11. Keywords11.1 mineral tanned leather; total chloridesASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any
17、such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are inv
18、ited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received
19、 a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of th
20、is standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 87 (2015)2
